DeerDidn't Crack Clan Yellow run Rabbit (I think it was him?) on pocket pyro for the majority of the season in open S15? You might be able to find some demos or something if you want to see some pros and cons if finding people to scrim against is difficult.
Yup! He has a looking thread as well.
I've got some crack clan yellow footage but hooey didn't go pyro as much at everyone thinks he did. Though he did do tons of work as pyro, made lange's stream chat & teammates get pissy about how unfair pyro is when we played against his pug team.